May weather forecast
Iowa City, IA

englishespañol中文
Share
Golden and brown trees in a scenic, neat lawn near the mighty grandeur of the Old Capitol building, Iowa City
Golden and brown trees in a scenic, neat lawn near the mighty grandeur of the Old Capitol building, Iowa City

Weather in May

May signifies the definitive arrival of spring in Iowa City. The city receives generous rainfall of 4.69" (119mm) which facilitates lush growth in parks and gardens. Temperatures gather momentum towards the imminent summer, and residents can now frequently venture outdoors without heavy winter clothing. The pleasantly warm days are often punctuated with refreshing bouts of showers.

Temperature

May's onset brings a temperature rise, moving from a refreshing 58.6°F (14.8°C) in April to a pleasant 69.8°F (21°C). May's average low-temperature reading settles at a cool 53.2°F (11.8°C).

Humidity

The average relative humidity in May in Iowa City is 78%.

Rainfall

May is the month with the most rainfall. Rain falls for 18.4 days and accumulates 4.69" (119mm) of precipitation.

Snowfall

May through September are months without snowfall.

Daylight

In Iowa City, Iowa, the average length of the day in May is 14h and 33min.
On the first day of the month, sunrise is at 6:01 am and sunset at 8:04 pm. On the last day of May, sunrise is at 5:34 am and sunset at 8:33 pm CDT.

Sunshine

The average sunshine in May in Iowa City is 8.7h.

UV index

In Iowa City, the average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for the average person.
Note: A maximum daily UV index of 5 during May morphs into the following directions:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
[Resources]

Frequently asked questions

What is the temperature in May in Iowa City?

The average high-temperature, in May, in Iowa City, is 69.8°F (21°C), while the average low-temperature is 53.2°F (11.8°C).

What is the average humidity in May in Iowa City?

In Iowa City, Iowa, the average relative humidity in May is 78%.

What is the wettest month in Iowa City?

May is the month with the most rainfall. Rain falls for 18.4 days and accumulates 4.69" (119mm) of precipitation.

How many days does it rain in May in Iowa City?

In Iowa City, during May, the rain falls for 18.4 days and regularly aggregates up to 4.69" (119mm) of precipitation.

When it does not snow in Iowa City?

May through September are months without snowfall.

Does it snow in Iowa City in May?

In May, in Iowa City, it doesn't snow. April is the latest month when it typically snows.

What is the average length of the day in May in Iowa City?

The average day length in May in Iowa City, Iowa, is 14h and 33min.

When are sunrise and sunset in May in Iowa City?

In May, on the first day of the month, sunrise is at 6:01 am and sunset at 8:04 pm. On the last day of the month, in Iowa City, Iowa, sunrise is at 5:34 am and sunset at 8:33 pm CDT.

How long on average sun shines in May in Iowa City?

In May, the average sunshine duration in Iowa City, Iowa, is 8.7h.

What is the UV index intensity in May in Iowa City?

The average daily maximum UV index in May in Iowa City, Iowa, is 5. A UV Index of 3 to 5 symbolizes a moderate health threat from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Iowa City, IA

Average temperature in May - Iowa City, IA
  • Average high temperature in May: 69.8°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (27.3°F).

  • Average low temperature in May: 53.2°F

The month with the highest average low temperature is July (64.6°F).
The coldest month (with the lowest average low temperature) is January (15.3°F).

[Resources]

Average pressure in May
Iowa City, IA

Average pressure in May - Iowa City, IA
  • Average pressure in May: 29.94"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

[Resources]

Average wind speed in May
Iowa City, IA

Average wind speed in May - Iowa City, IA
  • Average wind speed in May: 9mph

The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).

[Resources]

Average humidity in May
Iowa City, IA

Average humidity in May - Iowa City, IA
  • Average humidity in May: 78%

The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (72%).

[Resources]

Average rainfall in May
Iowa City, IA

Average rainfall in May - Iowa City, IA
  • Average rainfall in May: 4.69"

The wettest month (with the highest rainfall) is May (4.69").
The driest months (with the least rainfall) are January and February (1.34").

[Resources]

Average rainfall days in May
Iowa City, IA

Average rainfall days in May - Iowa City, IA
  • Average rainfall days in May: 18.4 days

The month with the highest number of rainy days is May (18.4 days).
The month with the least rainy days is February (5 days).

[Resources]

Average snowfall in May
Iowa City, IA

Average snowfall in May - Iowa City, IA
  • Average snowfall in May: 0"

The month with the highest snowfall is January (5.28").
The months with the least snowfall are May, June, July, August and September (0").

[Resources]

Average snowfall days in May
Iowa City, IA

Average snowfall days in May - Iowa City, IA
  • Average snowfall days in May: 0 days

The month with the highest number of snowfall days is January (10.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

[Resources]

Average daylight in May /
Average sunshine in May
Iowa City, IA

Average daylight in May / Average sunshine in May - Iowa City, IA
  • Average daylight in May: 14h and 4min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in May: 8h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

[Resources]

Average sunshine days in May
Iowa City, IA

Average sunshine days in May - Iowa City, IA
  • Average sunshine days in May: 10 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is May (10 days).

[Resources]

Average UV index in May
Iowa City, IA

Average UV index in May - Iowa City, IA
  • Average UV index in May: 5

The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).

[Resources]

Average cloud cover in May
Iowa City, IA

Average cloud cover in May - Iowa City, IA
  • Average cloud cover in May: 42

The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).

[Resources]

Average visibility in May
Iowa City, IA

Average visibility in May - Iowa City, IA
  • Average visibility in May: 6mi

The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).

[Resources]

Iowa City, Iowa, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location